cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A206689 Number of nX5 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order.

Table of values

n a(n)
1 4
2 116
3 704
4 4704
5 31504
6 213788
7 1454810
8 9933294
9 67923354
10 464901756
11 3183631874
12 21807955698
13 149409637478
14 1023727198288
15 7014765000890
16 48067928493696
17 329386094806172
18 2257144779520590
19 15467353757059122

List of values

[4, 116, 704, 4704, 31504, 213788, 1454810, 9933294, 67923354, 464901756, 3183631874, 21807955698, 149409637478, 1023727198288, 7014765000890, 48067928493696, 329386094806172, 2257144779520590, 15467353757059122]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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